EOSAM 2022
Open Access

Figure 14


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Geometrical construction to derive phase birefringence B(λ) from group birefringence Bg(λ) (black solid line) and a single-wavelength phase measurement B(λ1) (red circular dot); (a) construction of the tangent T2(λ) that crosses tangent T1(λ) at λx = (λ2 − λ1)/ln(λ2/λ1) (dashed blue lines), which allows one to find B(λ2);when the interval (λ2 − λ1)/λ1 is small, λx ≈ (λ2 + λ1)/2; (b) construction of B(λ) (dashed red curve) that must fit the tangents T1(λ) and T2(λ).

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